package com.luoani;

import java.util.HashMap;
import java.util.Map;
import java.util.Set;
import java.util.function.BiConsumer;

import static com.luoani.CollectionsDemo.test1;

public class MapDemo {
    public static void main(String[] args) {
        test1();
    }
    public  static void test3() {
        Map<String, Double> map = new HashMap<>();
        map.put("张三", 99.0);
        map.put("李四", 88.0);
        map.put("王五", 77.0);
        map.put("赵六", 66.0);

        map.forEach((key, aDouble) -> System.out.println(key + "---" + aDouble));
    }
    public static void test2() {
        Map<String, Double> map = new HashMap<>();
        map.put("张三", 99.0);
        map.put("李四", 88.0);
        map.put("王五", 77.0);
        map.put("赵六", 66.0);
        //1将map集合转成set集合（将map中的key-value绑定成一个对象entry）
        Set<Map.Entry<String, Double>> entrySet = map.entrySet();
        //2.遍历set集合
        for (Map.Entry<String, Double> entry : entrySet) {
        //3.根据entry对象获取key和value
            String key = entry.getKey();
            Double value = entry.getValue();
            System.out.println(key + "---" + value);
        }
    }


    public static void test0() {
        Map<String, Double> map = new HashMap<>();
        map.put("张三", 99.0);
        map.put("李四", 88.0);
        map.put("王五", 77.0);
        map.put("赵六", 66.0);
        map.put("赵六", 66.0);
        System.out.println(map);

//        map.remove("张三");
//        System.out.println(map);


        boolean b1 = map.containsKey("李四");
        System.out.println(b1);
        boolean b2 = map.containsValue(66.0);
        System.out.println(b2);

        boolean  b3 = map.isEmpty();
        System.out.println(b3);
        int size = map.size();
        System.out.println("size = "+size);
    }

    public static void test1() {
        Map<String, Double> map = new HashMap<>();
        map.put("张三", 99.0);
        map.put("李四", 88.0);
        map.put("王五", 77.0);
        map.put("赵六", 66.0);
        map.put("赵六", 66.0);
        //将map中所有键值取出来放在一个set集合中
        Set<String> keySet = map.keySet();
        for (String key : keySet) {
            Double  value = map.get(key);
            System.out.println(key+"---"+value);
        }

    }
}
